Telephone receiver



Jan. 18,1927. I 4,551

A. E. HEARNE TELEPHONE RECEIVER Filed Feb. 14, 1924 Patented Jan. 18, 1927. l

UNETE STATES PATENT OFFIQE.

ALEC EUSTACE IIEARNE, 0F LONDDN, ENGLALTD, ASSIGNOR TO STERLING TELEPHONE 85 ELECTRIC COMPANY, LIMITED, 05 LONDGN, ENGLAND, A BRITISH COMPANY.

TELEPHONE RECEIVER.

Application filed February 14, 1924, Serial No.

This invention relates to telephone receivers and its purpose is the production at much less cost than hitherto of a light and eflicient receiver.

To this end the invention comprises in the first place an improved form of stamping for the magnet of the receiver, such stamping being annular in form, extending over more than a semi circle, and having ing secured together and to the receiver case by screws each of which passes through both portions.

An embodiment of the invention is illustrated by way of example in the accompanying drawings in which Figures 1 and 2 are views at right angles of one of the stampings.

Figure 3 is a view of a receiver with the diaphragm and ear-piece removed.

Figure 4 is a view at right angles to Figure 3 with the case in section.

Each of the stampings from which the receiver magnet is made comprises an arcuate fiat yoke 1 extending over more than a semi circle. In the particular construction shown in Figures 1 and 2 the annular part is only slightly more than a semi circle, so that when two stampings are put together to form a complete annulus their ends just overlap. The magnet is completed by two pole pieces which receive windings. Unless it is desired to make these pole pieces laminated, as is sometimes done, they may be integral. with the stampings forming the yoke. For this purpose each stamping is increased in width towards one end, where there is a portion 3 projecting substantially radially, which may be turned up approximately at right angles to the stamping to serve as a pole piece. The complete magnet consists of a plurality of such stampings, at least two. To allow of the overlapping of their ends the arcuate portion 1 is slightly bent in its length, so that the plane of the wide end 2 is parallel to the plane of 692,872, and in Great Britain February 19, 1923.

the narrow end, but separated from it by substantially the thickness of the stamping. Consequently two identically similar stamplngs can be placed together with their dissimilar ends overlapping as seen in Figures 3 and 4.' The stampings have holes 1 in their ends, those 01: the one stamping registering with those of the other when the two are in position to form a complete annulus. The stampings are secured together, and if desired to the case 7 of the receiver, by screws 5 passing through these holes. Preferably these screws are insulated from one another for instance by insulating one or both from the magnet and the case, and serve as the terminals of the winding, which consists of two bobbins 6 placed on the upturned portions 3.

I claim 1. In a telephone receiver a magnet comprising two similar stampings each overlapping the other in a part of its length.

2 A permanent magnet for a telephone receiver comprising an arcuate stamping extending over more thanv a semi-circle, the thickness of the stamping being at right angles to the plane of the are, and having its ends in parallel planes substantially the thickness of the stamping apart.

3. In a telephone receiver an annular magnet comprising two precisely similar arcuate portions each extending over more than a semi circle and each overlapping the other in a part of its length.

4. In a telephone receiver a magnet comprising two arcuate stampings bent in their length in the direction of and substantially to the extent of their thickness, one end of each stamping overlapping one end of the other.

5. In a telephone receiver a magnet comprising two arcuate stampings bent in their length in the direction of and substantially to the extent of their thickness, one end of each stamping overlapping one end. of the other, each overlying end carrying a pole piece.

6. In a telephone receiver an annular magnet comprising two similar arcuate stampings each extending over more than a semi circle and having at one end of the are a substantially radial extension bent up approximately at right angles to the remainder of the stamping.

7. In a telephone receiver the combination with a case of two lnagnetised arcuate stampings fitting said case and forming together an annular magnet and each carrying a pole piece substantially at right angles to the arcuate portion, and two fastening screws each passing through both sta-mpings and into the case.

8. A stamping for a telephone magnet comprising an annular portion extending over more than a semi-circle, the thickness of the stamping being at right angles to the plane of the annulus, said portion being bent so that its ends lie in parallel planes the thickness of the stamping apart, and a substantially radial portion projecting inward from one end of said annular portion in the plane of that end and having its extremity bent at right angles to that plane to form a pole piece.

9. A stamping for a telephone magnet comprising an annular portion extending over more than a semi-circle the thickness of the stamping being at right angles to the plane of the annulus, said portion being bent so that its ends lie in parallel planes the thickness of the stamping apart and a substantially radial portion projecting inward from one of said ends and in the same plane therewith.

10. In a telephone receiver the combination with a case of arcuate stampings fitting said case and extending over more than a semi circle, each stamping having its ends lying in parallel planes and having at one end an upstanding pole piece, two screws each passing through the casing and through the stainpings but insulated therefrom, and windings upon the pole pieces having? their ends connected with said screws.

In testimony whereof I have signed my name to this specification.

ALEC E. HEAR I). 

